1 /* SCTP kernel reference Implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel reference Implementation 8 * 9 * The SCTP reference implementation is free software; 10 * you can redistribute it and/or modify it under the terms of 11 * the GNU General Public License as published by 12 * the Free Software Foundation; either version 2, or (at your option) 13 * any later version. 14 * 15 * The SCTP reference implementation is distributed in the hope that it 16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 17 * ************************ 18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 19 * See the GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with GNU CC; see the file COPYING. If not, write to 23 * the Free Software Foundation, 59 Temple Place - Suite 330, 24 * Boston, MA 02111-1307, USA. 25 * 26 * Please send any bug reports or fixes you make to the 27 * email addresses: 28 * lksctp developers <lksctp-developers@lists.sourceforge.net> 29 * 30 * Or submit a bug report through the following website: 31 * http://www.sf.net/projects/lksctp 32 * 33 * Written or modified by: 34 * Randall Stewart <randall@sctp.chicago.il.us> 35 * Ken Morneau <kmorneau@cisco.com> 36 * Qiaobing Xie <qxie1@email.mot.com> 37 * La Monte H.P. Yarroll <piggy@acm.org> 38 * Karl Knutson <karl@athena.chicago.il.us> 39 * Jon Grimm <jgrimm@us.ibm.com> 40 * Xingang Guo <xingang.guo@intel.com> 41 * Hui Huang <hui.huang@nokia.com> 42 * Sridhar Samudrala <sri@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com> 44 * Dajiang Zhang <dajiang.zhang@nokia.com> 45 * Ardelle Fan <ardelle.fan@intel.com> 46 * Ryan Layer <rmlayer@us.ibm.com> 47 * Anup Pemmaiah <pemmaiah@cc.usu.edu> 48 * Kevin Gao <kevin.gao@intel.com> 49 * 50 * Any bugs reported given to us we will try to fix... any fixes shared will 51 * be incorporated into the next SCTP release. 52 */ 53 54 #ifndef __sctp_structs_h__ 55 #define __sctp_structs_h__ 56 57 #include <linux/time.h> /* We get struct timespec. */ 58 #include <linux/socket.h> /* linux/in.h needs this!! */ 59 #include <linux/in.h> /* We get struct sockaddr_in. */ 60 #include <linux/in6.h> /* We get struct in6_addr */ 61 #include <linux/ipv6.h> 62 #include <asm/param.h> /* We get MAXHOSTNAMELEN. */ 63 #include <asm/atomic.h> /* This gets us atomic counters. */ 64 #include <linux/skbuff.h> /* We need sk_buff_head. */ 65 #include <linux/workqueue.h> /* We need tq_struct. */ 66 #include <linux/sctp.h> /* We need sctp* header structs. */ 67 #include <net/sctp/auth.h> /* We need auth specific structs */ 68 69 /* A convenience structure for handling sockaddr structures. 70 * We should wean ourselves off this. 71 */ 72 union sctp_addr { 73 struct sockaddr_in v4; 74 struct sockaddr_in6 v6; 75 struct sockaddr sa; 76 }; 77 78 /* Forward declarations for data structures. */ 79 struct sctp_globals; 80 struct sctp_endpoint; 81 struct sctp_association; 82 struct sctp_transport; 83 struct sctp_packet; 84 struct sctp_chunk; 85 struct sctp_inq; 86 struct sctp_outq; 87 struct sctp_bind_addr; 88 struct sctp_ulpq; 89 struct sctp_ep_common; 90 struct sctp_ssnmap; 91 struct crypto_hash; 92 93 94 #include <net/sctp/tsnmap.h> 95 #include <net/sctp/ulpevent.h> 96 #include <net/sctp/ulpqueue.h> 97 98 /* Structures useful for managing bind/connect. */ 99 100 struct sctp_bind_bucket { 101 unsigned short port; 102 unsigned short fastreuse; 103 struct sctp_bind_bucket *next; 104 struct sctp_bind_bucket **pprev; 105 struct hlist_head owner; 106 }; 107 108 struct sctp_bind_hashbucket { 109 spinlock_t lock; 110 struct sctp_bind_bucket *chain; 111 }; 112 113 /* Used for hashing all associations. */ 114 struct sctp_hashbucket { 115 rwlock_t lock; 116 struct sctp_ep_common *chain; 117 } __attribute__((__aligned__(8))); 118 119 120 /* The SCTP globals structure. */ 121 extern struct sctp_globals { 122 /* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values 123 * 124 * The following protocol parameters are RECOMMENDED: 125 * 126 * RTO.Initial - 3 seconds 127 * RTO.Min - 1 second 128 * RTO.Max - 60 seconds 129 * RTO.Alpha - 1/8 (3 when converted to right shifts.) 130 * RTO.Beta - 1/4 (2 when converted to right shifts.) 131 */ 132 unsigned int rto_initial; 133 unsigned int rto_min; 134 unsigned int rto_max; 135 136 /* Note: rto_alpha and rto_beta are really defined as inverse 137 * powers of two to facilitate integer operations. 138 */ 139 int rto_alpha; 140 int rto_beta; 141 142 /* Max.Burst - 4 */ 143 int max_burst; 144 145 /* Whether Cookie Preservative is enabled(1) or not(0) */ 146 int cookie_preserve_enable; 147 148 /* Valid.Cookie.Life - 60 seconds */ 149 unsigned int valid_cookie_life; 150 151 /* Delayed SACK timeout 200ms default*/ 152 unsigned int sack_timeout; 153 154 /* HB.interval - 30 seconds */ 155 unsigned int hb_interval; 156 157 /* Association.Max.Retrans - 10 attempts 158 * Path.Max.Retrans - 5 attempts (per destination address) 159 * Max.Init.Retransmits - 8 attempts 160 */ 161 int max_retrans_association; 162 int max_retrans_path; 163 int max_retrans_init; 164 165 /* 166 * Policy for preforming sctp/socket accounting 167 * 0 - do socket level accounting, all assocs share sk_sndbuf 168 * 1 - do sctp accounting, each asoc may use sk_sndbuf bytes 169 */ 170 int sndbuf_policy; 171 172 /* 173 * Policy for preforming sctp/socket accounting 174 * 0 - do socket level accounting, all assocs share sk_rcvbuf 175 * 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes 176 */ 177 int rcvbuf_policy; 178 179 /* The following variables are implementation specific. */ 180 181 /* Default initialization values to be applied to new associations. */ 182 __u16 max_instreams; 183 __u16 max_outstreams; 184 185 /* This is a list of groups of functions for each address 186 * family that we support. 187 */ 188 struct list_head address_families; 189 190 /* This is the hash of all endpoints. */ 191 int ep_hashsize; 192 struct sctp_hashbucket *ep_hashtable; 193 194 /* This is the hash of all associations. */ 195 int assoc_hashsize; 196 struct sctp_hashbucket *assoc_hashtable; 197 198 /* This is the sctp port control hash. */ 199 int port_hashsize; 200 struct sctp_bind_hashbucket *port_hashtable; 201 202 /* This is the global local address list. 203 * We actively maintain this complete list of addresses on 204 * the system by catching address add/delete events. 205 * 206 * It is a list of sctp_sockaddr_entry. 207 */ 208 struct list_head local_addr_list; 209 210 /* Lock that protects the local_addr_list writers */ 211 spinlock_t addr_list_lock; 212 213 /* Flag to indicate if addip is enabled. */ 214 int addip_enable; 215 216 /* Flag to indicate if PR-SCTP is enabled. */ 217 int prsctp_enable; 218 219 /* Flag to idicate if SCTP-AUTH is enabled */ 220 int auth_enable; 221 } sctp_globals; 222 223 #define sctp_rto_initial (sctp_globals.rto_initial) 224 #define sctp_rto_min (sctp_globals.rto_min) 225 #define sctp_rto_max (sctp_globals.rto_max) 226 #define sctp_rto_alpha (sctp_globals.rto_alpha) 227 #define sctp_rto_beta (sctp_globals.rto_beta) 228 #define sctp_max_burst (sctp_globals.max_burst) 229 #define sctp_valid_cookie_life (sctp_globals.valid_cookie_life) 230 #define sctp_cookie_preserve_enable (sctp_globals.cookie_preserve_enable) 231 #define sctp_max_retrans_association (sctp_globals.max_retrans_association) 232 #define sctp_sndbuf_policy (sctp_globals.sndbuf_policy) 233 #define sctp_rcvbuf_policy (sctp_globals.rcvbuf_policy) 234 #define sctp_max_retrans_path (sctp_globals.max_retrans_path) 235 #define sctp_max_retrans_init (sctp_globals.max_retrans_init) 236 #define sctp_sack_timeout (sctp_globals.sack_timeout) 237 #define sctp_hb_interval (sctp_globals.hb_interval) 238 #define sctp_max_instreams (sctp_globals.max_instreams) 239 #define sctp_max_outstreams (sctp_globals.max_outstreams) 240 #define sctp_address_families (sctp_globals.address_families) 241 #define sctp_ep_hashsize (sctp_globals.ep_hashsize) 242 #define sctp_ep_hashtable (sctp_globals.ep_hashtable) 243 #define sctp_assoc_hashsize (sctp_globals.assoc_hashsize) 244 #define sctp_assoc_hashtable (sctp_globals.assoc_hashtable) 245 #define sctp_port_hashsize (sctp_globals.port_hashsize) 246 #define sctp_port_rover (sctp_globals.port_rover) 247 #define sctp_port_alloc_lock (sctp_globals.port_alloc_lock) 248 #define sctp_port_hashtable (sctp_globals.port_hashtable) 249 #define sctp_local_addr_list (sctp_globals.local_addr_list) 250 #define sctp_local_addr_lock (sctp_globals.addr_list_lock) 251 #define sctp_addip_enable (sctp_globals.addip_enable) 252 #define sctp_prsctp_enable (sctp_globals.prsctp_enable) 253 #define sctp_auth_enable (sctp_globals.auth_enable) 254 255 /* SCTP Socket type: UDP or TCP style. */ 256 typedef enum { 257 SCTP_SOCKET_UDP = 0, 258 SCTP_SOCKET_UDP_HIGH_BANDWIDTH, 259 SCTP_SOCKET_TCP 260 } sctp_socket_type_t; 261 262 /* Per socket SCTP information. */ 263 struct sctp_sock { 264 /* inet_sock has to be the first member of sctp_sock */ 265 struct inet_sock inet; 266 /* What kind of a socket is this? */ 267 sctp_socket_type_t type; 268 269 /* PF_ family specific functions. */ 270 struct sctp_pf *pf; 271 272 /* Access to HMAC transform. */ 273 struct crypto_hash *hmac; 274 275 /* What is our base endpointer? */ 276 struct sctp_endpoint *ep; 277 278 struct sctp_bind_bucket *bind_hash; 279 /* Various Socket Options. */ 280 __u16 default_stream; 281 __u32 default_ppid; 282 __u16 default_flags; 283 __u32 default_context; 284 __u32 default_timetolive; 285 __u32 default_rcv_context; 286 int max_burst; 287 288 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 289 * the destination address every heartbeat interval. This value 290 * will be inherited by all new associations. 291 */ 292 __u32 hbinterval; 293 294 /* This is the max_retrans value for new associations. */ 295 __u16 pathmaxrxt; 296 297 /* The initial Path MTU to use for new associations. */ 298 __u32 pathmtu; 299 300 /* The default SACK delay timeout for new associations. */ 301 __u32 sackdelay; 302 303 /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ 304 __u32 param_flags; 305 306 struct sctp_initmsg initmsg; 307 struct sctp_rtoinfo rtoinfo; 308 struct sctp_paddrparams paddrparam; 309 struct sctp_event_subscribe subscribe; 310 struct sctp_assocparams assocparams; 311 int user_frag; 312 __u32 autoclose; 313 __u8 nodelay; 314 __u8 disable_fragments; 315 __u8 v4mapped; 316 __u8 frag_interleave; 317 __u32 adaptation_ind; 318 __u32 pd_point; 319 320 atomic_t pd_mode; 321 /* Receive to here while partial delivery is in effect. */ 322 struct sk_buff_head pd_lobby; 323 }; 324 325 static inline struct sctp_sock *sctp_sk(const struct sock *sk) 326 { 327 return (struct sctp_sock *)sk; 328 } 329 330 static inline struct sock *sctp_opt2sk(const struct sctp_sock *sp) 331 { 332 return (struct sock *)sp; 333 } 334 335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 336 struct sctp6_sock { 337 struct sctp_sock sctp; 338 struct ipv6_pinfo inet6; 339 }; 340 #endif /* CONFIG_IPV6 */ 341 342 343 /* This is our APPLICATION-SPECIFIC state cookie. 344 * THIS IS NOT DICTATED BY THE SPECIFICATION. 345 */ 346 /* These are the parts of an association which we send in the cookie. 347 * Most of these are straight out of: 348 * RFC2960 12.2 Parameters necessary per association (i.e. the TCB) 349 * 350 */ 351 352 struct sctp_cookie { 353 354 /* My : Tag expected in every inbound packet and sent 355 * Verification: in the INIT or INIT ACK chunk. 356 * Tag : 357 */ 358 __u32 my_vtag; 359 360 /* Peer's : Tag expected in every outbound packet except 361 * Verification: in the INIT chunk. 362 * Tag : 363 */ 364 __u32 peer_vtag; 365 366 /* The rest of these are not from the spec, but really need to 367 * be in the cookie. 368 */ 369 370 /* My Tie Tag : Assist in discovering a restarting association. */ 371 __u32 my_ttag; 372 373 /* Peer's Tie Tag: Assist in discovering a restarting association. */ 374 __u32 peer_ttag; 375 376 /* When does this cookie expire? */ 377 struct timeval expiration; 378 379 /* Number of inbound/outbound streams which are set 380 * and negotiated during the INIT process. 381 */ 382 __u16 sinit_num_ostreams; 383 __u16 sinit_max_instreams; 384 385 /* This is the first sequence number I used. */ 386 __u32 initial_tsn; 387 388 /* This holds the originating address of the INIT packet. */ 389 union sctp_addr peer_addr; 390 391 /* IG Section 2.35.3 392 * Include the source port of the INIT-ACK 393 */ 394 __u16 my_port; 395 396 __u8 prsctp_capable; 397 398 /* Padding for future use */ 399 __u8 padding; 400 401 __u32 adaptation_ind; 402 403 __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH]; 404 __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2]; 405 __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS]; 406 407 /* This is a shim for my peer's INIT packet, followed by 408 * a copy of the raw address list of the association. 409 * The length of the raw address list is saved in the 410 * raw_addr_list_len field, which will be used at the time when 411 * the association TCB is re-constructed from the cookie. 412 */ 413 __u32 raw_addr_list_len; 414 struct sctp_init_chunk peer_init[0]; 415 }; 416 417 418 /* The format of our cookie that we send to our peer. */ 419 struct sctp_signed_cookie { 420 __u8 signature[SCTP_SECRET_SIZE]; 421 __u32 __pad; /* force sctp_cookie alignment to 64 bits */ 422 struct sctp_cookie c; 423 } __attribute__((packed)); 424 425 /* This is another convenience type to allocate memory for address 426 * params for the maximum size and pass such structures around 427 * internally. 428 */ 429 union sctp_addr_param { 430 struct sctp_paramhdr p; 431 struct sctp_ipv4addr_param v4; 432 struct sctp_ipv6addr_param v6; 433 }; 434 435 /* A convenience type to allow walking through the various 436 * parameters and avoid casting all over the place. 437 */ 438 union sctp_params { 439 void *v; 440 struct sctp_paramhdr *p; 441 struct sctp_cookie_preserve_param *life; 442 struct sctp_hostname_param *dns; 443 struct sctp_cookie_param *cookie; 444 struct sctp_supported_addrs_param *sat; 445 struct sctp_ipv4addr_param *v4; 446 struct sctp_ipv6addr_param *v6; 447 union sctp_addr_param *addr; 448 struct sctp_adaptation_ind_param *aind; 449 struct sctp_supported_ext_param *ext; 450 struct sctp_random_param *random; 451 struct sctp_chunks_param *chunks; 452 struct sctp_hmac_algo_param *hmac_algo; 453 }; 454 455 /* RFC 2960. Section 3.3.5 Heartbeat. 456 * Heartbeat Information: variable length 457 * The Sender-specific Heartbeat Info field should normally include 458 * information about the sender's current time when this HEARTBEAT 459 * chunk is sent and the destination transport address to which this 460 * HEARTBEAT is sent (see Section 8.3). 461 */ 462 typedef struct sctp_sender_hb_info { 463 struct sctp_paramhdr param_hdr; 464 union sctp_addr daddr; 465 unsigned long sent_at; 466 __u64 hb_nonce; 467 } __attribute__((packed)) sctp_sender_hb_info_t; 468 469 /* 470 * RFC 2960 1.3.2 Sequenced Delivery within Streams 471 * 472 * The term "stream" is used in SCTP to refer to a sequence of user 473 * messages that are to be delivered to the upper-layer protocol in 474 * order with respect to other messages within the same stream. This is 475 * in contrast to its usage in TCP, where it refers to a sequence of 476 * bytes (in this document a byte is assumed to be eight bits). 477 * ... 478 * 479 * This is the structure we use to track both our outbound and inbound 480 * SSN, or Stream Sequence Numbers. 481 */ 482 483 struct sctp_stream { 484 __u16 *ssn; 485 unsigned int len; 486 }; 487 488 struct sctp_ssnmap { 489 struct sctp_stream in; 490 struct sctp_stream out; 491 int malloced; 492 }; 493 494 struct sctp_ssnmap *sctp_ssnmap_new(__u16 in, __u16 out, 495 gfp_t gfp); 496 void sctp_ssnmap_free(struct sctp_ssnmap *map); 497 void sctp_ssnmap_clear(struct sctp_ssnmap *map); 498 499 /* What is the current SSN number for this stream? */ 500 static inline __u16 sctp_ssn_peek(struct sctp_stream *stream, __u16 id) 501 { 502 return stream->ssn[id]; 503 } 504 505 /* Return the next SSN number for this stream. */ 506 static inline __u16 sctp_ssn_next(struct sctp_stream *stream, __u16 id) 507 { 508 return stream->ssn[id]++; 509 } 510 511 /* Skip over this ssn and all below. */ 512 static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id, 513 __u16 ssn) 514 { 515 stream->ssn[id] = ssn+1; 516 } 517 518 /* 519 * Pointers to address related SCTP functions. 520 * (i.e. things that depend on the address family.) 521 */ 522 struct sctp_af { 523 int (*sctp_xmit) (struct sk_buff *skb, 524 struct sctp_transport *, 525 int ipfragok); 526 int (*setsockopt) (struct sock *sk, 527 int level, 528 int optname, 529 char __user *optval, 530 int optlen); 531 int (*getsockopt) (struct sock *sk, 532 int level, 533 int optname, 534 char __user *optval, 535 int __user *optlen); 536 int (*compat_setsockopt) (struct sock *sk, 537 int level, 538 int optname, 539 char __user *optval, 540 int optlen); 541 int (*compat_getsockopt) (struct sock *sk, 542 int level, 543 int optname, 544 char __user *optval, 545 int __user *optlen); 546 struct dst_entry *(*get_dst) (struct sctp_association *asoc, 547 union sctp_addr *daddr, 548 union sctp_addr *saddr); 549 void (*get_saddr) (struct sctp_association *asoc, 550 struct dst_entry *dst, 551 union sctp_addr *daddr, 552 union sctp_addr *saddr); 553 void (*copy_addrlist) (struct list_head *, 554 struct net_device *); 555 void (*dst_saddr) (union sctp_addr *saddr, 556 struct dst_entry *dst, 557 __be16 port); 558 int (*cmp_addr) (const union sctp_addr *addr1, 559 const union sctp_addr *addr2); 560 void (*addr_copy) (union sctp_addr *dst, 561 union sctp_addr *src); 562 void (*from_skb) (union sctp_addr *, 563 struct sk_buff *skb, 564 int saddr); 565 void (*from_sk) (union sctp_addr *, 566 struct sock *sk); 567 void (*to_sk_saddr) (union sctp_addr *, 568 struct sock *sk); 569 void (*to_sk_daddr) (union sctp_addr *, 570 struct sock *sk); 571 void (*from_addr_param) (union sctp_addr *, 572 union sctp_addr_param *, 573 __be16 port, int iif); 574 int (*to_addr_param) (const union sctp_addr *, 575 union sctp_addr_param *); 576 int (*addr_valid) (union sctp_addr *, 577 struct sctp_sock *, 578 const struct sk_buff *); 579 sctp_scope_t (*scope) (union sctp_addr *); 580 void (*inaddr_any) (union sctp_addr *, __be16); 581 int (*is_any) (const union sctp_addr *); 582 int (*available) (union sctp_addr *, 583 struct sctp_sock *); 584 int (*skb_iif) (const struct sk_buff *sk); 585 int (*is_ce) (const struct sk_buff *sk); 586 void (*seq_dump_addr)(struct seq_file *seq, 587 union sctp_addr *addr); 588 __u16 net_header_len; 589 int sockaddr_len; 590 sa_family_t sa_family; 591 struct list_head list; 592 }; 593 594 struct sctp_af *sctp_get_af_specific(sa_family_t); 595 int sctp_register_af(struct sctp_af *); 596 597 /* Protocol family functions. */ 598 struct sctp_pf { 599 void (*event_msgname)(struct sctp_ulpevent *, char *, int *); 600 void (*skb_msgname) (struct sk_buff *, char *, int *); 601 int (*af_supported) (sa_family_t, struct sctp_sock *); 602 int (*cmp_addr) (const union sctp_addr *, 603 const union sctp_addr *, 604 struct sctp_sock *); 605 int (*bind_verify) (struct sctp_sock *, union sctp_addr *); 606 int (*send_verify) (struct sctp_sock *, union sctp_addr *); 607 int (*supported_addrs)(const struct sctp_sock *, __be16 *); 608 struct sock *(*create_accept_sk) (struct sock *sk, 609 struct sctp_association *asoc); 610 void (*addr_v4map) (struct sctp_sock *, union sctp_addr *); 611 struct sctp_af *af; 612 }; 613 614 615 /* Structure to track chunk fragments that have been acked, but peer 616 * fragments of the same message have not. 617 */ 618 struct sctp_datamsg { 619 /* Chunks waiting to be submitted to lower layer. */ 620 struct list_head chunks; 621 /* Chunks that have been transmitted. */ 622 struct list_head track; 623 /* Reference counting. */ 624 atomic_t refcnt; 625 /* When is this message no longer interesting to the peer? */ 626 unsigned long expires_at; 627 /* Did the messenge fail to send? */ 628 int send_error; 629 char send_failed; 630 /* Control whether chunks from this message can be abandoned. */ 631 char can_abandon; 632 }; 633 634 struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *, 635 struct sctp_sndrcvinfo *, 636 struct msghdr *, int len); 637 void sctp_datamsg_put(struct sctp_datamsg *); 638 void sctp_datamsg_free(struct sctp_datamsg *); 639 void sctp_datamsg_track(struct sctp_chunk *); 640 void sctp_chunk_fail(struct sctp_chunk *, int error); 641 int sctp_chunk_abandoned(struct sctp_chunk *); 642 643 /* RFC2960 1.4 Key Terms 644 * 645 * o Chunk: A unit of information within an SCTP packet, consisting of 646 * a chunk header and chunk-specific content. 647 * 648 * As a matter of convenience, we remember the SCTP common header for 649 * each chunk as well as a few other header pointers... 650 */ 651 struct sctp_chunk { 652 struct list_head list; 653 654 atomic_t refcnt; 655 656 /* This is our link to the per-transport transmitted list. */ 657 struct list_head transmitted_list; 658 659 /* This field is used by chunks that hold fragmented data. 660 * For the first fragment this is the list that holds the rest of 661 * fragments. For the remaining fragments, this is the link to the 662 * frag_list maintained in the first fragment. 663 */ 664 struct list_head frag_list; 665 666 /* This points to the sk_buff containing the actual data. */ 667 struct sk_buff *skb; 668 669 /* These are the SCTP headers by reverse order in a packet. 670 * Note that some of these may happen more than once. In that 671 * case, we point at the "current" one, whatever that means 672 * for that level of header. 673 */ 674 675 /* We point this at the FIRST TLV parameter to chunk_hdr. */ 676 union sctp_params param_hdr; 677 union { 678 __u8 *v; 679 struct sctp_datahdr *data_hdr; 680 struct sctp_inithdr *init_hdr; 681 struct sctp_sackhdr *sack_hdr; 682 struct sctp_heartbeathdr *hb_hdr; 683 struct sctp_sender_hb_info *hbs_hdr; 684 struct sctp_shutdownhdr *shutdown_hdr; 685 struct sctp_signed_cookie *cookie_hdr; 686 struct sctp_ecnehdr *ecne_hdr; 687 struct sctp_cwrhdr *ecn_cwr_hdr; 688 struct sctp_errhdr *err_hdr; 689 struct sctp_addiphdr *addip_hdr; 690 struct sctp_fwdtsn_hdr *fwdtsn_hdr; 691 struct sctp_authhdr *auth_hdr; 692 } subh; 693 694 __u8 *chunk_end; 695 696 struct sctp_chunkhdr *chunk_hdr; 697 struct sctphdr *sctp_hdr; 698 699 /* This needs to be recoverable for SCTP_SEND_FAILED events. */ 700 struct sctp_sndrcvinfo sinfo; 701 702 /* Which association does this belong to? */ 703 struct sctp_association *asoc; 704 705 /* What endpoint received this chunk? */ 706 struct sctp_ep_common *rcvr; 707 708 /* We fill this in if we are calculating RTT. */ 709 unsigned long sent_at; 710 711 /* What is the origin IP address for this chunk? */ 712 union sctp_addr source; 713 /* Destination address for this chunk. */ 714 union sctp_addr dest; 715 716 /* For outbound message, track all fragments for SEND_FAILED. */ 717 struct sctp_datamsg *msg; 718 719 /* For an inbound chunk, this tells us where it came from. 720 * For an outbound chunk, it tells us where we'd like it to 721 * go. It is NULL if we have no preference. 722 */ 723 struct sctp_transport *transport; 724 725 /* SCTP-AUTH: For the special case inbound processing of COOKIE-ECHO 726 * we need save a pointer to the AUTH chunk, since the SCTP-AUTH 727 * spec violates the principle premis that all chunks are processed 728 * in order. 729 */ 730 struct sk_buff *auth_chunk; 731 732 __u8 rtt_in_progress; /* Is this chunk used for RTT calculation? */ 733 __u8 resent; /* Has this chunk ever been retransmitted. */ 734 __u8 has_tsn; /* Does this chunk have a TSN yet? */ 735 __u8 has_ssn; /* Does this chunk have a SSN yet? */ 736 __u8 singleton; /* Was this the only chunk in the packet? */ 737 __u8 end_of_packet; /* Was this the last chunk in the packet? */ 738 __u8 ecn_ce_done; /* Have we processed the ECN CE bit? */ 739 __u8 pdiscard; /* Discard the whole packet now? */ 740 __u8 tsn_gap_acked; /* Is this chunk acked by a GAP ACK? */ 741 __s8 fast_retransmit; /* Is this chunk fast retransmitted? */ 742 __u8 tsn_missing_report; /* Data chunk missing counter. */ 743 __u8 data_accepted; /* At least 1 chunk in this packet accepted */ 744 __u8 auth; /* IN: was auth'ed | OUT: needs auth */ 745 }; 746 747 void sctp_chunk_hold(struct sctp_chunk *); 748 void sctp_chunk_put(struct sctp_chunk *); 749 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 750 struct iovec *data); 751 void sctp_chunk_free(struct sctp_chunk *); 752 void *sctp_addto_chunk(struct sctp_chunk *, int len, const void *data); 753 struct sctp_chunk *sctp_chunkify(struct sk_buff *, 754 const struct sctp_association *, 755 struct sock *); 756 void sctp_init_addrs(struct sctp_chunk *, union sctp_addr *, 757 union sctp_addr *); 758 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk); 759 760 /* This is a structure for holding either an IPv6 or an IPv4 address. */ 761 struct sctp_sockaddr_entry { 762 struct list_head list; 763 struct rcu_head rcu; 764 union sctp_addr a; 765 __u8 use_as_src; 766 __u8 valid; 767 }; 768 769 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *); 770 771 /* This structure holds lists of chunks as we are assembling for 772 * transmission. 773 */ 774 struct sctp_packet { 775 /* These are the SCTP header values (host order) for the packet. */ 776 __u16 source_port; 777 __u16 destination_port; 778 __u32 vtag; 779 780 /* This contains the payload chunks. */ 781 struct list_head chunk_list; 782 783 /* This is the overhead of the sctp and ip headers. */ 784 size_t overhead; 785 /* This is the total size of all chunks INCLUDING padding. */ 786 size_t size; 787 788 /* The packet is destined for this transport address. 789 * The function we finally use to pass down to the next lower 790 * layer lives in the transport structure. 791 */ 792 struct sctp_transport *transport; 793 794 /* pointer to the auth chunk for this packet */ 795 struct sctp_chunk *auth; 796 797 /* This packet contains a COOKIE-ECHO chunk. */ 798 __u8 has_cookie_echo; 799 800 /* This packet contains a SACK chunk. */ 801 __u8 has_sack; 802 803 /* This packet contains an AUTH chunk */ 804 __u8 has_auth; 805 806 /* This packet contains at least 1 DATA chunk */ 807 __u8 has_data; 808 809 /* SCTP cannot fragment this packet. So let ip fragment it. */ 810 __u8 ipfragok; 811 812 __u8 malloced; 813 }; 814 815 struct sctp_packet *sctp_packet_init(struct sctp_packet *, 816 struct sctp_transport *, 817 __u16 sport, __u16 dport); 818 struct sctp_packet *sctp_packet_config(struct sctp_packet *, __u32 vtag, int); 819 sctp_xmit_t sctp_packet_transmit_chunk(struct sctp_packet *, 820 struct sctp_chunk *); 821 sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *, 822 struct sctp_chunk *); 823 int sctp_packet_transmit(struct sctp_packet *); 824 void sctp_packet_free(struct sctp_packet *); 825 826 static inline int sctp_packet_empty(struct sctp_packet *packet) 827 { 828 return (packet->size == packet->overhead); 829 } 830 831 /* This represents a remote transport address. 832 * For local transport addresses, we just use union sctp_addr. 833 * 834 * RFC2960 Section 1.4 Key Terms 835 * 836 * o Transport address: A Transport Address is traditionally defined 837 * by Network Layer address, Transport Layer protocol and Transport 838 * Layer port number. In the case of SCTP running over IP, a 839 * transport address is defined by the combination of an IP address 840 * and an SCTP port number (where SCTP is the Transport protocol). 841 * 842 * RFC2960 Section 7.1 SCTP Differences from TCP Congestion control 843 * 844 * o The sender keeps a separate congestion control parameter set for 845 * each of the destination addresses it can send to (not each 846 * source-destination pair but for each destination). The parameters 847 * should decay if the address is not used for a long enough time 848 * period. 849 * 850 */ 851 struct sctp_transport { 852 /* A list of transports. */ 853 struct list_head transports; 854 855 /* Reference counting. */ 856 atomic_t refcnt; 857 int dead; 858 859 /* This is the peer's IP address and port. */ 860 union sctp_addr ipaddr; 861 862 /* These are the functions we call to handle LLP stuff. */ 863 struct sctp_af *af_specific; 864 865 /* Which association do we belong to? */ 866 struct sctp_association *asoc; 867 868 /* RFC2960 869 * 870 * 12.3 Per Transport Address Data 871 * 872 * For each destination transport address in the peer's 873 * address list derived from the INIT or INIT ACK chunk, a 874 * number of data elements needs to be maintained including: 875 */ 876 __u32 rtt; /* This is the most recent RTT. */ 877 878 /* RTO : The current retransmission timeout value. */ 879 unsigned long rto; 880 881 /* RTTVAR : The current RTT variation. */ 882 __u32 rttvar; 883 884 /* SRTT : The current smoothed round trip time. */ 885 __u32 srtt; 886 887 /* RTO-Pending : A flag used to track if one of the DATA 888 * chunks sent to this address is currently being 889 * used to compute a RTT. If this flag is 0, 890 * the next DATA chunk sent to this destination 891 * should be used to compute a RTT and this flag 892 * should be set. Every time the RTT 893 * calculation completes (i.e. the DATA chunk 894 * is SACK'd) clear this flag. 895 */ 896 int rto_pending; 897 898 /* 899 * These are the congestion stats. 900 */ 901 /* cwnd : The current congestion window. */ 902 __u32 cwnd; /* This is the actual cwnd. */ 903 904 /* ssthresh : The current slow start threshold value. */ 905 __u32 ssthresh; 906 907 /* partial : The tracking method for increase of cwnd when in 908 * bytes acked : congestion avoidance mode (see Section 6.2.2) 909 */ 910 __u32 partial_bytes_acked; 911 912 /* Data that has been sent, but not acknowledged. */ 913 __u32 flight_size; 914 915 /* Destination */ 916 struct dst_entry *dst; 917 /* Source address. */ 918 union sctp_addr saddr; 919 920 /* When was the last time(in jiffies) that a data packet was sent on 921 * this transport? This is used to adjust the cwnd when the transport 922 * becomes inactive. 923 */ 924 unsigned long last_time_used; 925 926 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 927 * the destination address every heartbeat interval. 928 */ 929 unsigned long hbinterval; 930 931 /* SACK delay timeout */ 932 unsigned long sackdelay; 933 934 /* When was the last time (in jiffies) that we heard from this 935 * transport? We use this to pick new active and retran paths. 936 */ 937 unsigned long last_time_heard; 938 939 /* Last time(in jiffies) when cwnd is reduced due to the congestion 940 * indication based on ECNE chunk. 941 */ 942 unsigned long last_time_ecne_reduced; 943 944 /* This is the max_retrans value for the transport and will 945 * be initialized from the assocs value. This can be changed 946 * using SCTP_SET_PEER_ADDR_PARAMS socket option. 947 */ 948 __u16 pathmaxrxt; 949 950 /* is the Path MTU update pending on this tranport */ 951 __u8 pmtu_pending; 952 953 /* PMTU : The current known path MTU. */ 954 __u32 pathmtu; 955 956 /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ 957 __u32 param_flags; 958 959 /* The number of times INIT has been sent on this transport. */ 960 int init_sent_count; 961 962 /* state : The current state of this destination, 963 * : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN. 964 */ 965 int state; 966 967 /* These are the error stats for this destination. */ 968 969 /* Error count : The current error count for this destination. */ 970 unsigned short error_count; 971 972 /* Per : A timer used by each destination. 973 * Destination : 974 * Timer : 975 * 976 * [Everywhere else in the text this is called T3-rtx. -ed] 977 */ 978 struct timer_list T3_rtx_timer; 979 980 /* Heartbeat timer is per destination. */ 981 struct timer_list hb_timer; 982 983 /* Since we're using per-destination retransmission timers 984 * (see above), we're also using per-destination "transmitted" 985 * queues. This probably ought to be a private struct 986 * accessible only within the outqueue, but it's not, yet. 987 */ 988 struct list_head transmitted; 989 990 /* We build bundle-able packets for this transport here. */ 991 struct sctp_packet packet; 992 993 /* This is the list of transports that have chunks to send. */ 994 struct list_head send_ready; 995 996 int malloced; /* Is this structure kfree()able? */ 997 998 /* State information saved for SFR_CACC algorithm. The key 999 * idea in SFR_CACC is to maintain state at the sender on a 1000 * per-destination basis when a changeover happens. 1001 * char changeover_active; 1002 * char cycling_changeover; 1003 * __u32 next_tsn_at_change; 1004 * char cacc_saw_newack; 1005 */ 1006 struct { 1007 /* An unsigned integer, which stores the next TSN to be 1008 * used by the sender, at the moment of changeover. 1009 */ 1010 __u32 next_tsn_at_change; 1011 1012 /* A flag which indicates the occurrence of a changeover */ 1013 char changeover_active; 1014 1015 /* A flag which indicates whether the change of primary is 1016 * the first switch to this destination address during an 1017 * active switch. 1018 */ 1019 char cycling_changeover; 1020 1021 /* A temporary flag, which is used during the processing of 1022 * a SACK to estimate the causative TSN(s)'s group. 1023 */ 1024 char cacc_saw_newack; 1025 } cacc; 1026 1027 /* 64-bit random number sent with heartbeat. */ 1028 __u64 hb_nonce; 1029 }; 1030 1031 struct sctp_transport *sctp_transport_new(const union sctp_addr *, 1032 gfp_t); 1033 void sctp_transport_set_owner(struct sctp_transport *, 1034 struct sctp_association *); 1035 void sctp_transport_route(struct sctp_transport *, union sctp_addr *, 1036 struct sctp_sock *); 1037 void sctp_transport_pmtu(struct sctp_transport *); 1038 void sctp_transport_free(struct sctp_transport *); 1039 void sctp_transport_reset_timers(struct sctp_transport *); 1040 void sctp_transport_hold(struct sctp_transport *); 1041 void sctp_transport_put(struct sctp_transport *); 1042 void sctp_transport_update_rto(struct sctp_transport *, __u32); 1043 void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32); 1044 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t); 1045 unsigned long sctp_transport_timeout(struct sctp_transport *); 1046 void sctp_transport_reset(struct sctp_transport *); 1047 void sctp_transport_update_pmtu(struct sctp_transport *, u32); 1048 1049 1050 /* This is the structure we use to queue packets as they come into 1051 * SCTP. We write packets to it and read chunks from it. 1052 */ 1053 struct sctp_inq { 1054 /* This is actually a queue of sctp_chunk each 1055 * containing a partially decoded packet. 1056 */ 1057 struct list_head in_chunk_list; 1058 /* This is the packet which is currently off the in queue and is 1059 * being worked on through the inbound chunk processing. 1060 */ 1061 struct sctp_chunk *in_progress; 1062 1063 /* This is the delayed task to finish delivering inbound 1064 * messages. 1065 */ 1066 struct work_struct immediate; 1067 1068 int malloced; /* Is this structure kfree()able? */ 1069 }; 1070 1071 void sctp_inq_init(struct sctp_inq *); 1072 void sctp_inq_free(struct sctp_inq *); 1073 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet); 1074 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *); 1075 struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *); 1076 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t); 1077 1078 /* This is the structure we use to hold outbound chunks. You push 1079 * chunks in and they automatically pop out the other end as bundled 1080 * packets (it calls (*output_handler)()). 1081 * 1082 * This structure covers sections 6.3, 6.4, 6.7, 6.8, 6.10, 7., 8.1, 1083 * and 8.2 of the v13 draft. 1084 * 1085 * It handles retransmissions. The connection to the timeout portion 1086 * of the state machine is through sctp_..._timeout() and timeout_handler. 1087 * 1088 * If you feed it SACKs, it will eat them. 1089 * 1090 * If you give it big chunks, it will fragment them. 1091 * 1092 * It assigns TSN's to data chunks. This happens at the last possible 1093 * instant before transmission. 1094 * 1095 * When free()'d, it empties itself out via output_handler(). 1096 */ 1097 struct sctp_outq { 1098 struct sctp_association *asoc; 1099 1100 /* Data pending that has never been transmitted. */ 1101 struct list_head out_chunk_list; 1102 1103 unsigned out_qlen; /* Total length of queued data chunks. */ 1104 1105 /* Error of send failed, may used in SCTP_SEND_FAILED event. */ 1106 unsigned error; 1107 1108 /* These are control chunks we want to send. */ 1109 struct list_head control_chunk_list; 1110 1111 /* These are chunks that have been sacked but are above the 1112 * CTSN, or cumulative tsn ack point. 1113 */ 1114 struct list_head sacked; 1115 1116 /* Put chunks on this list to schedule them for 1117 * retransmission. 1118 */ 1119 struct list_head retransmit; 1120 1121 /* Put chunks on this list to save them for FWD TSN processing as 1122 * they were abandoned. 1123 */ 1124 struct list_head abandoned; 1125 1126 /* How many unackd bytes do we have in-flight? */ 1127 __u32 outstanding_bytes; 1128 1129 /* Corked? */ 1130 char cork; 1131 1132 /* Is this structure empty? */ 1133 char empty; 1134 1135 /* Are we kfree()able? */ 1136 char malloced; 1137 }; 1138 1139 void sctp_outq_init(struct sctp_association *, struct sctp_outq *); 1140 void sctp_outq_teardown(struct sctp_outq *); 1141 void sctp_outq_free(struct sctp_outq*); 1142 int sctp_outq_tail(struct sctp_outq *, struct sctp_chunk *chunk); 1143 int sctp_outq_flush(struct sctp_outq *, int); 1144 int sctp_outq_sack(struct sctp_outq *, struct sctp_sackhdr *); 1145 int sctp_outq_is_empty(const struct sctp_outq *); 1146 void sctp_outq_restart(struct sctp_outq *); 1147 1148 void sctp_retransmit(struct sctp_outq *, struct sctp_transport *, 1149 sctp_retransmit_reason_t); 1150 void sctp_retransmit_mark(struct sctp_outq *, struct sctp_transport *, __u8); 1151 int sctp_outq_uncork(struct sctp_outq *); 1152 /* Uncork and flush an outqueue. */ 1153 static inline void sctp_outq_cork(struct sctp_outq *q) 1154 { 1155 q->cork = 1; 1156 } 1157 1158 /* These bind address data fields common between endpoints and associations */ 1159 struct sctp_bind_addr { 1160 1161 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1162 * 1163 * SCTP Port: The local SCTP port number the endpoint is 1164 * bound to. 1165 */ 1166 __u16 port; 1167 1168 /* RFC 2960 12.1 Parameters necessary for the SCTP instance 1169 * 1170 * Address List: The list of IP addresses that this instance 1171 * has bound. This information is passed to one's 1172 * peer(s) in INIT and INIT ACK chunks. 1173 */ 1174 struct list_head address_list; 1175 1176 int malloced; /* Are we kfree()able? */ 1177 }; 1178 1179 void sctp_bind_addr_init(struct sctp_bind_addr *, __u16 port); 1180 void sctp_bind_addr_free(struct sctp_bind_addr *); 1181 int sctp_bind_addr_copy(struct sctp_bind_addr *dest, 1182 const struct sctp_bind_addr *src, 1183 sctp_scope_t scope, gfp_t gfp, 1184 int flags); 1185 int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1186 __u8 use_as_src, gfp_t gfp); 1187 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *, 1188 void fastcall (*rcu_call)(struct rcu_head *, 1189 void (*func)(struct rcu_head *))); 1190 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *, 1191 struct sctp_sock *); 1192 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, 1193 const union sctp_addr *addrs, 1194 int addrcnt, 1195 struct sctp_sock *opt); 1196 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, 1197 int *addrs_len, 1198 gfp_t gfp); 1199 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw, int len, 1200 __u16 port, gfp_t gfp); 1201 1202 sctp_scope_t sctp_scope(const union sctp_addr *); 1203 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope); 1204 int sctp_is_any(const union sctp_addr *addr); 1205 int sctp_addr_is_valid(const union sctp_addr *addr); 1206 1207 1208 /* What type of endpoint? */ 1209 typedef enum { 1210 SCTP_EP_TYPE_SOCKET, 1211 SCTP_EP_TYPE_ASSOCIATION, 1212 } sctp_endpoint_type_t; 1213 1214 /* 1215 * A common base class to bridge the implmentation view of a 1216 * socket (usually listening) endpoint versus an association's 1217 * local endpoint. 1218 * This common structure is useful for several purposes: 1219 * 1) Common interface for lookup routines. 1220 * a) Subfunctions work for either endpoint or association 1221 * b) Single interface to lookup allows hiding the lookup lock rather 1222 * than acquiring it externally. 1223 * 2) Common interface for the inbound chunk handling/state machine. 1224 * 3) Common object handling routines for reference counting, etc. 1225 * 4) Disentangle association lookup from endpoint lookup, where we 1226 * do not have to find our endpoint to find our association. 1227 * 1228 */ 1229 1230 struct sctp_ep_common { 1231 /* Fields to help us manage our entries in the hash tables. */ 1232 struct sctp_ep_common *next; 1233 struct sctp_ep_common **pprev; 1234 int hashent; 1235 1236 /* Runtime type information. What kind of endpoint is this? */ 1237 sctp_endpoint_type_t type; 1238 1239 /* Some fields to help us manage this object. 1240 * refcnt - Reference count access to this object. 1241 * dead - Do not attempt to use this object. 1242 * malloced - Do we need to kfree this object? 1243 */ 1244 atomic_t refcnt; 1245 char dead; 1246 char malloced; 1247 1248 /* What socket does this endpoint belong to? */ 1249 struct sock *sk; 1250 1251 /* This is where we receive inbound chunks. */ 1252 struct sctp_inq inqueue; 1253 1254 /* This substructure includes the defining parameters of the 1255 * endpoint: 1256 * bind_addr.port is our shared port number. 1257 * bind_addr.address_list is our set of local IP addresses. 1258 */ 1259 struct sctp_bind_addr bind_addr; 1260 }; 1261 1262 1263 /* RFC Section 1.4 Key Terms 1264 * 1265 * o SCTP endpoint: The logical sender/receiver of SCTP packets. On a 1266 * multi-homed host, an SCTP endpoint is represented to its peers as a 1267 * combination of a set of eligible destination transport addresses to 1268 * which SCTP packets can be sent and a set of eligible source 1269 * transport addresses from which SCTP packets can be received. 1270 * All transport addresses used by an SCTP endpoint must use the 1271 * same port number, but can use multiple IP addresses. A transport 1272 * address used by an SCTP endpoint must not be used by another 1273 * SCTP endpoint. In other words, a transport address is unique 1274 * to an SCTP endpoint. 1275 * 1276 * From an implementation perspective, each socket has one of these. 1277 * A TCP-style socket will have exactly one association on one of 1278 * these. An UDP-style socket will have multiple associations hanging 1279 * off one of these. 1280 */ 1281 1282 struct sctp_endpoint { 1283 /* Common substructure for endpoint and association. */ 1284 struct sctp_ep_common base; 1285 1286 /* Associations: A list of current associations and mappings 1287 * to the data consumers for each association. This 1288 * may be in the form of a hash table or other 1289 * implementation dependent structure. The data 1290 * consumers may be process identification 1291 * information such as file descriptors, named pipe 1292 * pointer, or table pointers dependent on how SCTP 1293 * is implemented. 1294 */ 1295 /* This is really a list of struct sctp_association entries. */ 1296 struct list_head asocs; 1297 1298 /* Secret Key: A secret key used by this endpoint to compute 1299 * the MAC. This SHOULD be a cryptographic quality 1300 * random number with a sufficient length. 1301 * Discussion in [RFC1750] can be helpful in 1302 * selection of the key. 1303 */ 1304 __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE]; 1305 int current_key; 1306 int last_key; 1307 int key_changed_at; 1308 1309 /* digest: This is a digest of the sctp cookie. This field is 1310 * only used on the receive path when we try to validate 1311 * that the cookie has not been tampered with. We put 1312 * this here so we pre-allocate this once and can re-use 1313 * on every receive. 1314 */ 1315 __u8 *digest; 1316 1317 /* sendbuf acct. policy. */ 1318 __u32 sndbuf_policy; 1319 1320 /* rcvbuf acct. policy. */ 1321 __u32 rcvbuf_policy; 1322 1323 /* SCTP AUTH: array of the HMACs that will be allocated 1324 * we need this per association so that we don't serialize 1325 */ 1326 struct crypto_hash **auth_hmacs; 1327 1328 /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */ 1329 struct sctp_hmac_algo_param *auth_hmacs_list; 1330 1331 /* SCTP-AUTH: chunks to authenticate encoded into parameter */ 1332 struct sctp_chunks_param *auth_chunk_list; 1333 1334 /* SCTP-AUTH: endpoint shared keys */ 1335 struct list_head endpoint_shared_keys; 1336 __u16 active_key_id; 1337 }; 1338 1339 /* Recover the outter endpoint structure. */ 1340 static inline struct sctp_endpoint *sctp_ep(struct sctp_ep_common *base) 1341 { 1342 struct sctp_endpoint *ep; 1343 1344 ep = container_of(base, struct sctp_endpoint, base); 1345 return ep; 1346 } 1347 1348 /* These are function signatures for manipulating endpoints. */ 1349 struct sctp_endpoint *sctp_endpoint_new(struct sock *, gfp_t); 1350 void sctp_endpoint_free(struct sctp_endpoint *); 1351 void sctp_endpoint_put(struct sctp_endpoint *); 1352 void sctp_endpoint_hold(struct sctp_endpoint *); 1353 void sctp_endpoint_add_asoc(struct sctp_endpoint *, struct sctp_association *); 1354 struct sctp_association *sctp_endpoint_lookup_assoc( 1355 const struct sctp_endpoint *ep, 1356 const union sctp_addr *paddr, 1357 struct sctp_transport **); 1358 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *, 1359 const union sctp_addr *); 1360 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *, 1361 const union sctp_addr *); 1362 int sctp_has_association(const union sctp_addr *laddr, 1363 const union sctp_addr *paddr); 1364 1365 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t, 1366 sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 1367 struct sctp_chunk **err_chunk); 1368 int sctp_process_init(struct sctp_association *, sctp_cid_t cid, 1369 const union sctp_addr *peer, 1370 sctp_init_chunk_t *init, gfp_t gfp); 1371 __u32 sctp_generate_tag(const struct sctp_endpoint *); 1372 __u32 sctp_generate_tsn(const struct sctp_endpoint *); 1373 1374 struct sctp_inithdr_host { 1375 __u32 init_tag; 1376 __u32 a_rwnd; 1377 __u16 num_outbound_streams; 1378 __u16 num_inbound_streams; 1379 __u32 initial_tsn; 1380 }; 1381 1382 /* RFC2960 1383 * 1384 * 12. Recommended Transmission Control Block (TCB) Parameters 1385 * 1386 * This section details a recommended set of parameters that should 1387 * be contained within the TCB for an implementation. This section is 1388 * for illustrative purposes and should not be deemed as requirements 1389 * on an implementation or as an exhaustive list of all parameters 1390 * inside an SCTP TCB. Each implementation may need its own additional 1391 * parameters for optimization. 1392 */ 1393 1394 1395 /* Here we have information about each individual association. */ 1396 struct sctp_association { 1397 1398 /* A base structure common to endpoint and association. 1399 * In this context, it represents the associations's view 1400 * of the local endpoint of the association. 1401 */ 1402 struct sctp_ep_common base; 1403 1404 /* Associations on the same socket. */ 1405 struct list_head asocs; 1406 1407 /* association id. */ 1408 sctp_assoc_t assoc_id; 1409 1410 /* This is our parent endpoint. */ 1411 struct sctp_endpoint *ep; 1412 1413 /* These are those association elements needed in the cookie. */ 1414 struct sctp_cookie c; 1415 1416 /* This is all information about our peer. */ 1417 struct { 1418 /* rwnd 1419 * 1420 * Peer Rwnd : Current calculated value of the peer's rwnd. 1421 */ 1422 __u32 rwnd; 1423 1424 /* transport_addr_list 1425 * 1426 * Peer : A list of SCTP transport addresses that the 1427 * Transport : peer is bound to. This information is derived 1428 * Address : from the INIT or INIT ACK and is used to 1429 * List : associate an inbound packet with a given 1430 * : association. Normally this information is 1431 * : hashed or keyed for quick lookup and access 1432 * : of the TCB. 1433 * : The list is also initialized with the list 1434 * : of addresses passed with the sctp_connectx() 1435 * : call. 1436 * 1437 * It is a list of SCTP_transport's. 1438 */ 1439 struct list_head transport_addr_list; 1440 1441 /* transport_count 1442 * 1443 * Peer : A count of the number of peer addresses 1444 * Transport : in the Peer Transport Address List. 1445 * Address : 1446 * Count : 1447 */ 1448 __u16 transport_count; 1449 1450 /* port 1451 * The transport layer port number. 1452 */ 1453 __u16 port; 1454 1455 /* primary_path 1456 * 1457 * Primary : This is the current primary destination 1458 * Path : transport address of the peer endpoint. It 1459 * : may also specify a source transport address 1460 * : on this endpoint. 1461 * 1462 * All of these paths live on transport_addr_list. 1463 * 1464 * At the bakeoffs, we discovered that the intent of 1465 * primaryPath is that it only changes when the ULP 1466 * asks to have it changed. We add the activePath to 1467 * designate the connection we are currently using to 1468 * transmit new data and most control chunks. 1469 */ 1470 struct sctp_transport *primary_path; 1471 1472 /* Cache the primary path address here, when we 1473 * need a an address for msg_name. 1474 */ 1475 union sctp_addr primary_addr; 1476 1477 /* active_path 1478 * The path that we are currently using to 1479 * transmit new data and most control chunks. 1480 */ 1481 struct sctp_transport *active_path; 1482 1483 /* retran_path 1484 * 1485 * RFC2960 6.4 Multi-homed SCTP Endpoints 1486 * ... 1487 * Furthermore, when its peer is multi-homed, an 1488 * endpoint SHOULD try to retransmit a chunk to an 1489 * active destination transport address that is 1490 * different from the last destination address to 1491 * which the DATA chunk was sent. 1492 */ 1493 struct sctp_transport *retran_path; 1494 1495 /* Pointer to last transport I have sent on. */ 1496 struct sctp_transport *last_sent_to; 1497 1498 /* This is the last transport I have received DATA on. */ 1499 struct sctp_transport *last_data_from; 1500 1501 /* 1502 * Mapping An array of bits or bytes indicating which out of 1503 * Array order TSN's have been received (relative to the 1504 * Last Rcvd TSN). If no gaps exist, i.e. no out of 1505 * order packets have been received, this array 1506 * will be set to all zero. This structure may be 1507 * in the form of a circular buffer or bit array. 1508 * 1509 * Last Rcvd : This is the last TSN received in 1510 * TSN : sequence. This value is set initially by 1511 * : taking the peer's Initial TSN, received in 1512 * : the INIT or INIT ACK chunk, and subtracting 1513 * : one from it. 1514 * 1515 * Throughout most of the specification this is called the 1516 * "Cumulative TSN ACK Point". In this case, we 1517 * ignore the advice in 12.2 in favour of the term 1518 * used in the bulk of the text. This value is hidden 1519 * in tsn_map--we get it by calling sctp_tsnmap_get_ctsn(). 1520 */ 1521 struct sctp_tsnmap tsn_map; 1522 __u8 _map[sctp_tsnmap_storage_size(SCTP_TSN_MAP_SIZE)]; 1523 1524 /* Ack State : This flag indicates if the next received 1525 * : packet is to be responded to with a 1526 * : SACK. This is initializedto 0. When a packet 1527 * : is received it is incremented. If this value 1528 * : reaches 2 or more, a SACK is sent and the 1529 * : value is reset to 0. Note: This is used only 1530 * : when no DATA chunks are received out of 1531 * : order. When DATA chunks are out of order, 1532 * : SACK's are not delayed (see Section 6). 1533 */ 1534 __u8 sack_needed; /* Do we need to sack the peer? */ 1535 1536 /* These are capabilities which our peer advertised. */ 1537 __u8 ecn_capable; /* Can peer do ECN? */ 1538 __u8 ipv4_address; /* Peer understands IPv4 addresses? */ 1539 __u8 ipv6_address; /* Peer understands IPv6 addresses? */ 1540 __u8 hostname_address;/* Peer understands DNS addresses? */ 1541 __u8 asconf_capable; /* Does peer support ADDIP? */ 1542 __u8 prsctp_capable; /* Can peer do PR-SCTP? */ 1543 __u8 auth_capable; /* Is peer doing SCTP-AUTH? */ 1544 __u8 addip_capable; /* Can peer do ADD-IP */ 1545 1546 __u32 adaptation_ind; /* Adaptation Code point. */ 1547 1548 /* This mask is used to disable sending the ASCONF chunk 1549 * with specified parameter to peer. 1550 */ 1551 __be16 addip_disabled_mask; 1552 1553 struct sctp_inithdr_host i; 1554 int cookie_len; 1555 void *cookie; 1556 1557 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1558 * C1) ... "Peer-Serial-Number'. This value MUST be initialized to the 1559 * Initial TSN Value minus 1 1560 */ 1561 __u32 addip_serial; 1562 1563 /* SCTP-AUTH: We need to know pears random number, hmac list 1564 * and authenticated chunk list. All that is part of the 1565 * cookie and these are just pointers to those locations 1566 */ 1567 sctp_random_param_t *peer_random; 1568 sctp_chunks_param_t *peer_chunks; 1569 sctp_hmac_algo_param_t *peer_hmacs; 1570 } peer; 1571 1572 /* State : A state variable indicating what state the 1573 * : association is in, i.e. COOKIE-WAIT, 1574 * : COOKIE-ECHOED, ESTABLISHED, SHUTDOWN-PENDING, 1575 * : SHUTDOWN-SENT, SHUTDOWN-RECEIVED, SHUTDOWN-ACK-SENT. 1576 * 1577 * Note: No "CLOSED" state is illustrated since if a 1578 * association is "CLOSED" its TCB SHOULD be removed. 1579 * 1580 * In this implementation we DO have a CLOSED 1581 * state which is used during initiation and shutdown. 1582 * 1583 * State takes values from SCTP_STATE_*. 1584 */ 1585 sctp_state_t state; 1586 1587 /* The cookie life I award for any cookie. */ 1588 struct timeval cookie_life; 1589 1590 /* Overall : The overall association error count. 1591 * Error Count : [Clear this any time I get something.] 1592 */ 1593 int overall_error_count; 1594 1595 /* These are the association's initial, max, and min RTO values. 1596 * These values will be initialized by system defaults, but can 1597 * be modified via the SCTP_RTOINFO socket option. 1598 */ 1599 unsigned long rto_initial; 1600 unsigned long rto_max; 1601 unsigned long rto_min; 1602 1603 /* Maximum number of new data packets that can be sent in a burst. */ 1604 int max_burst; 1605 1606 /* This is the max_retrans value for the association. This value will 1607 * be initialized initialized from system defaults, but can be 1608 * modified by the SCTP_ASSOCINFO socket option. 1609 */ 1610 int max_retrans; 1611 1612 /* Maximum number of times the endpoint will retransmit INIT */ 1613 __u16 max_init_attempts; 1614 1615 /* How many times have we resent an INIT? */ 1616 __u16 init_retries; 1617 1618 /* The largest timeout or RTO value to use in attempting an INIT */ 1619 unsigned long max_init_timeo; 1620 1621 /* Heartbeat interval: The endpoint sends out a Heartbeat chunk to 1622 * the destination address every heartbeat interval. This value 1623 * will be inherited by all new transports. 1624 */ 1625 unsigned long hbinterval; 1626 1627 /* This is the max_retrans value for new transports in the 1628 * association. 1629 */ 1630 __u16 pathmaxrxt; 1631 1632 /* Flag that path mtu update is pending */ 1633 __u8 pmtu_pending; 1634 1635 /* Association : The smallest PMTU discovered for all of the 1636 * PMTU : peer's transport addresses. 1637 */ 1638 __u32 pathmtu; 1639 1640 /* Flags controling Heartbeat, SACK delay, and Path MTU Discovery. */ 1641 __u32 param_flags; 1642 1643 /* SACK delay timeout */ 1644 unsigned long sackdelay; 1645 1646 1647 unsigned long timeouts[SCTP_NUM_TIMEOUT_TYPES]; 1648 struct timer_list timers[SCTP_NUM_TIMEOUT_TYPES]; 1649 1650 /* Transport to which SHUTDOWN chunk was last sent. */ 1651 struct sctp_transport *shutdown_last_sent_to; 1652 1653 /* Transport to which INIT chunk was last sent. */ 1654 struct sctp_transport *init_last_sent_to; 1655 1656 /* Next TSN : The next TSN number to be assigned to a new 1657 * : DATA chunk. This is sent in the INIT or INIT 1658 * : ACK chunk to the peer and incremented each 1659 * : time a DATA chunk is assigned a TSN 1660 * : (normally just prior to transmit or during 1661 * : fragmentation). 1662 */ 1663 __u32 next_tsn; 1664 1665 /* 1666 * Last Rcvd : This is the last TSN received in sequence. This value 1667 * TSN : is set initially by taking the peer's Initial TSN, 1668 * : received in the INIT or INIT ACK chunk, and 1669 * : subtracting one from it. 1670 * 1671 * Most of RFC 2960 refers to this as the Cumulative TSN Ack Point. 1672 */ 1673 1674 __u32 ctsn_ack_point; 1675 1676 /* PR-SCTP Advanced.Peer.Ack.Point */ 1677 __u32 adv_peer_ack_point; 1678 1679 /* Highest TSN that is acknowledged by incoming SACKs. */ 1680 __u32 highest_sacked; 1681 1682 /* The number of unacknowledged data chunks. Reported through 1683 * the SCTP_STATUS sockopt. 1684 */ 1685 __u16 unack_data; 1686 1687 /* This is the association's receive buffer space. This value is used 1688 * to set a_rwnd field in an INIT or a SACK chunk. 1689 */ 1690 __u32 rwnd; 1691 1692 /* This is the last advertised value of rwnd over a SACK chunk. */ 1693 __u32 a_rwnd; 1694 1695 /* Number of bytes by which the rwnd has slopped. The rwnd is allowed 1696 * to slop over a maximum of the association's frag_point. 1697 */ 1698 __u32 rwnd_over; 1699 1700 /* This is the sndbuf size in use for the association. 1701 * This corresponds to the sndbuf size for the association, 1702 * as specified in the sk->sndbuf. 1703 */ 1704 int sndbuf_used; 1705 1706 /* This is the amount of memory that this association has allocated 1707 * in the receive path at any given time. 1708 */ 1709 atomic_t rmem_alloc; 1710 1711 /* This is the wait queue head for send requests waiting on 1712 * the association sndbuf space. 1713 */ 1714 wait_queue_head_t wait; 1715 1716 /* The message size at which SCTP fragmentation will occur. */ 1717 __u32 frag_point; 1718 1719 /* Counter used to count INIT errors. */ 1720 int init_err_counter; 1721 1722 /* Count the number of INIT cycles (for doubling timeout). */ 1723 int init_cycle; 1724 1725 /* Default send parameters. */ 1726 __u16 default_stream; 1727 __u16 default_flags; 1728 __u32 default_ppid; 1729 __u32 default_context; 1730 __u32 default_timetolive; 1731 1732 /* Default receive parameters */ 1733 __u32 default_rcv_context; 1734 1735 /* This tracks outbound ssn for a given stream. */ 1736 struct sctp_ssnmap *ssnmap; 1737 1738 /* All outbound chunks go through this structure. */ 1739 struct sctp_outq outqueue; 1740 1741 /* A smart pipe that will handle reordering and fragmentation, 1742 * as well as handle passing events up to the ULP. 1743 */ 1744 struct sctp_ulpq ulpq; 1745 1746 /* Last TSN that caused an ECNE Chunk to be sent. */ 1747 __u32 last_ecne_tsn; 1748 1749 /* Last TSN that caused a CWR Chunk to be sent. */ 1750 __u32 last_cwr_tsn; 1751 1752 /* How many duplicated TSNs have we seen? */ 1753 int numduptsns; 1754 1755 /* Number of seconds of idle time before an association is closed. 1756 * In the association context, this is really used as a boolean 1757 * since the real timeout is stored in the timeouts array 1758 */ 1759 __u32 autoclose; 1760 1761 /* These are to support 1762 * "SCTP Extensions for Dynamic Reconfiguration of IP Addresses 1763 * and Enforcement of Flow and Message Limits" 1764 * <draft-ietf-tsvwg-addip-sctp-02.txt> 1765 * or "ADDIP" for short. 1766 */ 1767 1768 1769 1770 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1771 * 1772 * R1) One and only one ASCONF Chunk MAY be in transit and 1773 * unacknowledged at any one time. If a sender, after sending 1774 * an ASCONF chunk, decides it needs to transfer another 1775 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1776 * returns from the previous ASCONF Chunk before sending a 1777 * subsequent ASCONF. Note this restriction binds each side, 1778 * so at any time two ASCONF may be in-transit on any given 1779 * association (one sent from each endpoint). 1780 * 1781 * [This is our one-and-only-one ASCONF in flight. If we do 1782 * not have an ASCONF in flight, this is NULL.] 1783 */ 1784 struct sctp_chunk *addip_last_asconf; 1785 1786 /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. 1787 * 1788 * IMPLEMENTATION NOTE: As an optimization a receiver may wish 1789 * to save the last ASCONF-ACK for some predetermined period 1790 * of time and instead of re-processing the ASCONF (with the 1791 * same serial number) it may just re-transmit the 1792 * ASCONF-ACK. It may wish to use the arrival of a new serial 1793 * number to discard the previously saved ASCONF-ACK or any 1794 * other means it may choose to expire the saved ASCONF-ACK. 1795 * 1796 * [This is our saved ASCONF-ACK. We invalidate it when a new 1797 * ASCONF serial number arrives.] 1798 */ 1799 struct sctp_chunk *addip_last_asconf_ack; 1800 1801 /* These ASCONF chunks are waiting to be sent. 1802 * 1803 * These chunaks can't be pushed to outqueue until receiving 1804 * ASCONF_ACK for the previous ASCONF indicated by 1805 * addip_last_asconf, so as to guarantee that only one ASCONF 1806 * is in flight at any time. 1807 * 1808 * ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks 1809 * 1810 * In defining the ASCONF Chunk transfer procedures, it is 1811 * essential that these transfers MUST NOT cause congestion 1812 * within the network. To achieve this, we place these 1813 * restrictions on the transfer of ASCONF Chunks: 1814 * 1815 * R1) One and only one ASCONF Chunk MAY be in transit and 1816 * unacknowledged at any one time. If a sender, after sending 1817 * an ASCONF chunk, decides it needs to transfer another 1818 * ASCONF Chunk, it MUST wait until the ASCONF-ACK Chunk 1819 * returns from the previous ASCONF Chunk before sending a 1820 * subsequent ASCONF. Note this restriction binds each side, 1821 * so at any time two ASCONF may be in-transit on any given 1822 * association (one sent from each endpoint). 1823 * 1824 * 1825 * [I really think this is EXACTLY the sort of intelligence 1826 * which already resides in sctp_outq. Please move this 1827 * queue and its supporting logic down there. --piggy] 1828 */ 1829 struct list_head addip_chunk_list; 1830 1831 /* ADDIP Section 4.1 ASCONF Chunk Procedures 1832 * 1833 * A2) A serial number should be assigned to the Chunk. The 1834 * serial number SHOULD be a monotonically increasing 1835 * number. The serial number SHOULD be initialized at 1836 * the start of the association to the same value as the 1837 * Initial TSN and every time a new ASCONF chunk is created 1838 * it is incremented by one after assigning the serial number 1839 * to the newly created chunk. 1840 * 1841 * ADDIP 1842 * 3.1.1 Address/Stream Configuration Change Chunk (ASCONF) 1843 * 1844 * Serial Number : 32 bits (unsigned integer) 1845 * 1846 * This value represents a Serial Number for the ASCONF 1847 * Chunk. The valid range of Serial Number is from 0 to 1848 * 4294967295 (2^32 - 1). Serial Numbers wrap back to 0 1849 * after reaching 4294967295. 1850 */ 1851 __u32 addip_serial; 1852 1853 /* SCTP AUTH: list of the endpoint shared keys. These 1854 * keys are provided out of band by the user applicaton 1855 * and can't change during the lifetime of the association 1856 */ 1857 struct list_head endpoint_shared_keys; 1858 1859 /* SCTP AUTH: 1860 * The current generated assocaition shared key (secret) 1861 */ 1862 struct sctp_auth_bytes *asoc_shared_key; 1863 1864 /* SCTP AUTH: hmac id of the first peer requested algorithm 1865 * that we support. 1866 */ 1867 __u16 default_hmac_id; 1868 1869 __u16 active_key_id; 1870 1871 /* Need to send an ECNE Chunk? */ 1872 char need_ecne; 1873 1874 /* Is it a temporary association? */ 1875 char temp; 1876 }; 1877 1878 1879 /* An eyecatcher for determining if we are really looking at an 1880 * association data structure. 1881 */ 1882 enum { 1883 SCTP_ASSOC_EYECATCHER = 0xa550c123, 1884 }; 1885 1886 /* Recover the outter association structure. */ 1887 static inline struct sctp_association *sctp_assoc(struct sctp_ep_common *base) 1888 { 1889 struct sctp_association *asoc; 1890 1891 asoc = container_of(base, struct sctp_association, base); 1892 return asoc; 1893 } 1894 1895 /* These are function signatures for manipulating associations. */ 1896 1897 1898 struct sctp_association * 1899 sctp_association_new(const struct sctp_endpoint *, const struct sock *, 1900 sctp_scope_t scope, gfp_t gfp); 1901 void sctp_association_free(struct sctp_association *); 1902 void sctp_association_put(struct sctp_association *); 1903 void sctp_association_hold(struct sctp_association *); 1904 1905 struct sctp_transport *sctp_assoc_choose_init_transport( 1906 struct sctp_association *); 1907 struct sctp_transport *sctp_assoc_choose_shutdown_transport( 1908 struct sctp_association *); 1909 void sctp_assoc_update_retran_path(struct sctp_association *); 1910 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *, 1911 const union sctp_addr *); 1912 int sctp_assoc_lookup_laddr(struct sctp_association *asoc, 1913 const union sctp_addr *laddr); 1914 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *, 1915 const union sctp_addr *address, 1916 const gfp_t gfp, 1917 const int peer_state); 1918 void sctp_assoc_del_peer(struct sctp_association *asoc, 1919 const union sctp_addr *addr); 1920 void sctp_assoc_rm_peer(struct sctp_association *asoc, 1921 struct sctp_transport *peer); 1922 void sctp_assoc_control_transport(struct sctp_association *, 1923 struct sctp_transport *, 1924 sctp_transport_cmd_t, sctp_sn_error_t); 1925 struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32); 1926 struct sctp_transport *sctp_assoc_is_match(struct sctp_association *, 1927 const union sctp_addr *, 1928 const union sctp_addr *); 1929 void sctp_assoc_migrate(struct sctp_association *, struct sock *); 1930 void sctp_assoc_update(struct sctp_association *old, 1931 struct sctp_association *new); 1932 1933 __u32 sctp_association_get_next_tsn(struct sctp_association *); 1934 1935 void sctp_assoc_sync_pmtu(struct sctp_association *); 1936 void sctp_assoc_rwnd_increase(struct sctp_association *, unsigned); 1937 void sctp_assoc_rwnd_decrease(struct sctp_association *, unsigned); 1938 void sctp_assoc_set_primary(struct sctp_association *, 1939 struct sctp_transport *); 1940 int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *, 1941 gfp_t); 1942 int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *, 1943 struct sctp_cookie*, 1944 gfp_t gfp); 1945 int sctp_assoc_set_id(struct sctp_association *, gfp_t); 1946 1947 int sctp_cmp_addr_exact(const union sctp_addr *ss1, 1948 const union sctp_addr *ss2); 1949 struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc); 1950 1951 /* A convenience structure to parse out SCTP specific CMSGs. */ 1952 typedef struct sctp_cmsgs { 1953 struct sctp_initmsg *init; 1954 struct sctp_sndrcvinfo *info; 1955 } sctp_cmsgs_t; 1956 1957 /* Structure for tracking memory objects */ 1958 typedef struct { 1959 char *label; 1960 atomic_t *counter; 1961 } sctp_dbg_objcnt_entry_t; 1962 1963 #endif /* __sctp_structs_h__ */ 1964